How strong is the evidence for Protein Intake?

Multiple systematic reviews, meta-analyses, and expert position papers (including PROT-AGE and ESPEN guidelines) consistently support higher dietary protein intake for preserving muscle mass and function in older adults, particularly to counteract sarcopenia and protect lean mass during weight loss. That evidence is currently rated moderate (58/100), built on 6 published studies, including 1 meta-analysis -- a reasonable base, but not yet enough for full certainty.